twkhjl blog

[...arr.join("")]

...

function numArr(num) {
  return [...new Array(num).keys()].map(el=>`${el+1}`);
}

語法(簡單):

var newArray = 原始陣列.filter(callback[, thisArg])

...

使用Object.defineProperty()

(writable設為false即可)

物件陣列.forEach(function(el){
      el.屬性名稱=屬性值;
  });